ZE:A's Kwanghee and Siwan pose with MMA fighter Choo Sung Hoon

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Siwan shared the above photo on his Twitter on the 17th and wrote, "The meetup of Siwan and Sung Hoon hyung!!! Kwanghee annoyingly joined us and broke the atmosphere."

The photo shows Siwan and Kwanghee smiling at the camera with Choo Sung Hoon, revealing their close friendship. Choo Sung Hoon and Kwanghee are seen sporting their aviator sunglasses while Siwan is seen wearing a Detroit Lions cap. Fans also noticed how the matching black outfits of the three celebrities highlighted Siwan's milky skin.

Siwan and Kwanghee are known to be best friends and had fans smiling with their cute bickering towards each other.

In other news, ZE:A is currently preparing for their 'Live Concert Tour' to begin in Japan on October 2nd.